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Day 3

Day 3. Section 5 - Event Approach to Simulation Events Implementation of the Event Approach Canceling Events Exercise 5 Section 6 - Simulation Output Analysis Random Numbers and Statistics Modernizing a Bank - with replications Presentation Graphics Exercise 6. F.

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Day 3

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  1. Day 3 • Section 5 - Event Approach to Simulation • Events • Implementation of the Event Approach • Canceling Events • Exercise 5 • Section 6 - Simulation Output Analysis • Random Numbers and Statistics • Modernizing a Bank - with replications • Presentation Graphics • Exercise 6 F —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-1

  2. Section 5 - The Event Approach to Simulation Part 1 - Events —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-2

  3. Modeling with Events instead of Processes • Instead of putting a sequence of events in a single process, we may model them separately. • Mechanism is the same Event notice Event routine • Rather than 1 process with 2 events there will be 2 separate event types and routines. • Cannot use resources, so we'll write our own code to mimic them. —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-3

  4. Scheduling Events Schedule an END.TAKEOFF in 2 minutes (event) Activate a DEPARTURE now (process) • Activate, reactivate, schedule and reschedule are synonyms —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-4

  5. Memory for Events • Same as processes Event notice for each instance Local memory for each instance • Event notice destroyed on entry, not return • Local memory released when the event routine completes execution —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-5

  6. Passing Arguments to Events • Events are routines. They can receive but not yield arguments. • Arguments are passed to routines immediately because control is passed immediately. • Events do not get control immediately, so we need a temporary storage for the values. —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-6

  7. Passing Arguments to Events (continued) • Use attributes of event notices • In Preamble Every END.TAKEOFF has an ET.AIRCRAFT.POINTER • In another routine Schedule an END.TAKEOFF called .ET in 4 minutes Let ET.AIRCRAFT.POINTER(.ET) = .AIRPLANE —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-7

  8. Passing Arguments to Events (continued) • New routine Event END.TAKEOFF Given .AC ''Pointer to an airplane … <Statements> … End ‘’END.TAKEOFF —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-8

  9. System Attributes ET.AIRCRAFT.POINTER .AIRPLANE .AC Passing Arguments to Events (continued) —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-9

  10. Section 5 - The Event Approach to Simulation Part 2 - Implementation of the Event Approach —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-10

  11. The Airport Model (revisited) • As an example of discrete event simulation, let's rewrite the process version of the airport as a sequence of events. • We'll break the process DEPARTURE into two events, use sets to simulate the resource, RUNWAY, and put the waiting time data in a temporary entity. —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-11

  12. 1 Preamble 2 3 '' The Airport Model using events - CACI Products Company 4 '' files: AIRPORT1.SRC 5 6 Normally mode is undefined 7 8 Event notices include 9 AIRPLANE.GENERATOR, 10 NEW.AIRPLANE, 11 END.TAKEOFF and 12 FINAL.REPORT 13 14 Every END.TAKEOFF has 15 an ET.AIRCRAFT.POINTER 16 17 Define ET.AIRCRAFT.POINTER as a pointer variable 18 19 Temporary entities 20 21 Every AIRPLANE has 22 an AP.BEGIN.WAIT.TIME and 23 belongs to the QUE.RUNWAY and 24 the EXE.RUNWAY 25 26 Define AP.BEGIN.WAIT.TIME as a real variable 27 28 The system owns 29 the QUE.RUNWAY and 30 the EXE.RUNWAY 31 —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-12

  13. 32 '' Global variables 33 34 Define MINIMUM.INTER.DEPARTURE.TIME, 35 MAXIMUM.INTER.DEPARTURE.TIME, 36 MINIMUM.TAKE.OFF.TIME, 37 MAXIMUM.TAKE.OFF.TIME and 38 RUN.LENGTH 39 as real variables 40 41 Define NO.OF.RUNWAYS and 42 MAX.NO.OF.WAITING.AIRPLANES 43 as integer variables 44 Define MAX.WAITING.TIME as a real variable 45 46 End ''Preamble 1 Main 2 3 Call READ.DATA 4 5 Schedule a FINAL.REPORT in RUN.LENGTH hours 6 Schedule an AIRPLANE.GENERATOR now 7 8 Start simulation 9 10 End ''Main —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-13

  14. 1 Routine READ.DATA 2 3 Print 3 lines thus Enter the minimum and maximum times between airplane departures (in minutes) Minimum time: 7 Read MINIMUM.INTER.DEPARTURE.TIME 8 9 Print 1 line thus Maximum time: 11 Read MAXIMUM.INTER.DEPARTURE.TIME 12 13 Print 2 lines thus Enter the minimum and maximum takeoff times (in minutes) Minimum time: 16 Read MINIMUM.TAKE.OFF.TIME 17 18 Print 1 line thus Maximum time: 20 Read MAXIMUM.TAKE.OFF.TIME 21 22 Print 1 line thus Enter the number of runways 24 Read NO.OF.RUNWAYS 25 26 Print 1 line thus Enter the run length (in hours) 28 Read RUN.LENGTH 29 30 End ''READ.DATA —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-14

  15. 1 Event AIRPLANE.GENERATOR 2 saving the event notice 3 4 Define .TIME.TO.QUIT as a real variable 5 6 Let .TIME.TO.QUIT = RUN.LENGTH / hours.v 7 8 If time.v <= .TIME.TO.QUIT 9 10 Schedule a NEW.AIRPLANE now 11 Reschedule this AIRPLANE.GENERATOR 12 in uniform.f(MINIMUM.INTER.DEPARTURE.TIME, 13 MAXIMUM.INTER.DEPARTURE.TIME, 14 1) minutes 15 Endif ''time.v <= .TIME.TO.QUIT 16 17 End ''AIRPLANE.GENERATOR 1 Event FINAL.REPORT 2 3 Print 4 lines with time.v * hours.v, 4 MAX.WAITING.TIME * hours.v * minutes.v, 5 MAX.NO.OF.WAITING.AIRPLANES thus The simulation ended at **.* hours The maximum waiting time was **.** minutes The maximum number of aircraft waiting at any one time was **. 10 11 Read as / using unit 5 12 13 Stop 14 15 End ''FINAL.REPORT —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-15

  16. 1 Event NEW.AIRPLANE 2 3 Define .AP as an integer variable 4 5 Create an AIRPLANE called .AP 6 7 If N.EXE.RUNWAY < NO.OF.RUNWAYS 8 9 File .AP in the EXE.RUNWAY 10 Schedule an END.TAKEOFF 11 Given 12 .AP 13 in uniform.f(MINIMUM.TAKE.OFF.TIME, 14 MAXIMUM.TAKE.OFF.TIME, 15 2) minutes 16 17 Else 18 19 File .AP in the QUE.RUNWAY 20 Let AP.BEGIN.WAIT.TIME(.AP) = time.v 21 Let MAX.NO.OF.WAITING.AIRPLANES 22 = max.f(N.QUE.RUNWAY, MAX.NO.OF.WAITING.AIRPLANES) 23 24 Endif ''N.EXE.RUNWAY < NO.OF.RUNWAYS 25 26 End ''NEW.AIRPLANE —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-16

  17. 1 Event END.TAKEOFF 2 Given 3 .AC 4 5 Define .AC and 6 .AIRPLANE 7 as pointer variables 8 9 Define .WAITING.TIME as a real variable 10 11 Remove .AC from the EXE.RUNWAY 12 Destroy the AIRPLANE called .AC 13 14 If the QUE.RUNWAY is not empty 15 Remove the first .AIRPLANE from the QUE.RUNWAY 16 File .AIRPLANE in the EXE.RUNWAY 17 Schedule an END.TAKEOFF 18 Given 19 .AIRPLANE 20 in uniform.f(MINIMUM.TAKE.OFF.TIME, 21 MAXIMUM.TAKE.OFF.TIME, 22 2) minutes 23 Let .WAITING.TIME = time.v - AP.BEGIN.WAIT.TIME(.AIRPLANE) 24 Let MAX.WAITING.TIME = max.f(.WAITING.TIME, MAX.WAITING.TIME) 25 Endif ''the QUE.RUNWAY is not empty 26 27 End ''END.TAKEOFF —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-17

  18. Enter the minimum and maximum times between airplane departures (in minutes) Minimum time: 1 Maximum time: 3 Enter the minimum and maximum takeoff times (in minutes) Maximum time: 3 Minimum time: 5 Enter the number of runways 2 Enter the run length (in hours) 10 The simulation ended at 10.0 hours The maximum waiting time was 8.03 minutes The maximum number of aircraft waiting at any one time was 5. —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-18

  19. This page is intentionally blank —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-19

  20. Section 5 - The Event Approach to Simulation Part 3 - Canceling Events —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-20

  21. Ev.s consists of multiple sets - one for each process and event defined in the preamble. This cuts search time. I.AIRPLANE I.NEW. I.END. I.FINAL. GENERATOR AIRPLANE TAKEOFF REPORT F.EV.S L.EV.S More on The Event Set —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-21

  22. Example of Cancellation Let .AC = F.EXE.RUNWAY For each .ET in ev.s (I.END.TAKEOFF) with ET.AIRCRAFT.POINTER (.ET) = .AC Find the first case If found Cancel the END.TAKEOFF called .ET Destroy the END.TAKEOFF called .ET Remove .AC from EXE.RUNWAY File .AC in MAINTENANCE.FACILITY Endif ''found —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-22

  23. Pros and Cons of Events and Processes • Pros for Events • Less memory • Event notices have 5 attributes instead of 9 • Local memory not saved • Event notice not saved • Cons for Events • Need alternative to resources • Why are events used? • Habit • Event modeling is older than process modeling • Easier for new simulation programmer to grasp —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-23

  24. Exercise 5 The Port Problem Using Events C:\Program Files\Simscript3\models\EventPort —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-24

  25. Pacific Port Problem using Events • See "EventPort" Directory for Model • With 1 tug and 3 docks, a 365-day simulation results in • 792 ships being unloaded • Average waiting time is 4.01 hours • Maximum waiting time of 34.00 hours • How do these results compare with your process version of the Pacific Port Problem? • Consider changes to model • Dock is held longer than need be - especially if more tugs are used. • Tug moves instantly to appropriate location (dock vs. harbor entrance). Assume travel time without a ship is 15 minutes —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-25

  26. Preamble 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 Preamble '' CACI Products Company '' '' The Port model using events - Day 1 Solution '' Source Code: EventPort.SRC Normally mode is undefined ''Major events are requesting & releasing the dock and the tugs. Event notices include SHIP.GENERATOR, REQUEST.DOCK, REQUEST.TUG, RELEASE.TUG, RELEASE.DOCK and FINAL.REPORT Every REQUEST.TUG has an RQT.SHIP.PTR Define RQT.SHIP.PTR as a pointer variable Every RELEASE.TUG has an RLT.SHIP.PTR Define RLT.SHIP.PTR as a pointer variable Every RELEASE.DOCK has an RD.SHIP.PTR Define RD.SHIP.PTR as a pointer variable ''SHIPS are the entities that travel through the system Temporary entities Every SHIP has a SHIP.ARRIVAL.TIME, a SHIP.STATUS and a SHIP.UNLOAD.TIME and belongs to the QUE.DOCK, the EXE.DOCK, the QUE.TUG and the EXE.TUG Define SHIP.ARRIVAL.TIME and SHIP.UNLOAD.TIME as real variables Define SHIP.STATUS as an integer variable —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-26

  27. Preamble (continued) 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 ''Service is provided by a HARBOR that contains docks and tugs Permanent entities Every HARBOR has a NUMBER.OF.DOCKS and a NUMBER.OF.TUGS and owns a QUE.DOCK, an EXE.DOCK, a QUE.TUG and an EXE.TUG Define NUMBER.OF.DOCKS and NUMBER.OF.TUGS as integer variables '' Input Global variables Define RUN.LENGTH as a real variable '' Output Global Variables provide statistics collection Define TOTAL.WAITING.TIME and MAX.WAITING.TIME as real variables Define NO.OF.SHIPS.SERVED as an integer variable '' Synonyms provide clarity to the model Define ..AT.HARBOR to mean 1 Define ..TO.DOCK to mean 2 Define ..AT.DOCK to mean 3 Define ..TO.SEA to mean 4 Define ..AT.SEA to mean 5 End ''Preamble —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-27

  28. Main Routine & Initialization 1 2 3 4 5 6 7 8 9 10 Main Call READ.DATA ''to set up simulation Schedule a FINAL.REPORT in RUN.LENGTH days Schedule a SHIP.GENERATOR now ''to create new ships Start simulation End ''Main 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 Routine READ.DATA Define .NBR.TUGS and .NBR.DOCKS as integer variables Open unit 10 for input, name = "PORT.DAT" Use unit 10 for input Skip 3 fields Read .NBR.TUGS Skip 3 fields Read .NBR.DOCKS Skip 3 fields Read RUN.LENGTH Close unit 10 ''Create 1 harbor that contains .NBR.DOCKS & .NBR.TUGS Let N.HARBOR = 1 Create each HARBOR Let NUMBER.OF.TUGS(1) = .NBR.TUGS Let NUMBER.OF.DOCKS(1) = .NBR.DOCKS End ''READ.DATA —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-28

  29. Generate Ships 1 2 3 4 5 6 7 8 9 10 11 Event SHIP.GENERATOR saving the event notice If time.v <= RUN.LENGTH Schedule a REQUEST.DOCK now Reschedule this SHIP.GENERATOR in uniform.f(4.0, 18.0, 1) hours Endif ''time.v <= RUN.LENGTH End ''SHIP.GENERATOR —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-29

  30. Request the Dock 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 Event REQUEST.DOCK Define .PROBABILITY as a real variable Define .SHIP as a pointer variable ''Create a new ship and set up attributes for unloading time, ''arrival time and status. Arrival time is used to calculate ''the total time in system when the ship leaves the harbor. Create a SHIP called .SHIP ''Unloading time differs for each type of ship Let .PROBABILITY = random.f(2) Select case .PROBABILITY Case 0.0 to 0.25 Let SHIP.UNLOAD.TIME(.SHIP) = uniform.f(16.0,20.0,3) Case 0.25 to 0.80 Let SHIP.UNLOAD.TIME(.SHIP) = uniform.f(21.0, 27.0, 3) Default Let SHIP.UNLOAD.TIME(.SHIP) = uniform.f(32.0, 40.0, 3) Endselect ''.PROBABILITY ''Store time ship enters system Let SHIP.ARRIVAL.TIME(.SHIP) = time.v ''Set status Let SHIP.STATUS(.SHIP) = ..AT.HARBOR ''Grab dock if available. Then schedule a request for a Tug ''to take SHIP to the dock If N.EXE.DOCK(1) < NUMBER.OF.DOCKS(1) File .SHIP in the EXE.DOCK(1) Schedule a REQUEST.TUG giving .SHIP now Else File .SHIP in the QUE.DOCK(1) Endif ''N.EXE.DOCK(1) < NUMBER.OF.DOCKS(1) End ''REQUEST.DOCK —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-30

  31. Request the Tug 1 Event REQUEST.TUG 2 given .RQT.SHIP.PTR 3 4 Define .RQT.SHIP.PTR as a pointer variable 5 6 ''Tug is available 7 If N.EXE.TUG(1) < NUMBER.OF.TUGS(1) 8 9 File .RQT.SHIP.PTR in the EXE.TUG(1) 10 11 ''Change the ship status. If ship has just been created, 12 ''indicate that it will be taken to the dock by the tug. 13 ''If the ship was already at the dock, then it has unloaded 14 ''its cargo and is ready to depart to sea 15 Select case SHIP.STATUS(.RQT.SHIP.PTR) 16 Case ..AT.HARBOR 17 Let SHIP.STATUS(.RQT.SHIP.PTR) = ..TO.DOCK 18 Case ..AT.DOCK 19 Let SHIP.STATUS(.RQT.SHIP.PTR) = ..TO.SEA 20 Default 21 Print 1 line with time.v and SHIP.STATUS(.RQT.SHIP.PTR) thus *******.*** ERROR in REQUEST.TUG: Invalid ship status *** 23 Stop 24 Endselect 25 26 ''1 hour is needed to move the ship to or from the dock 27 Schedule a RELEASE.TUG giving .RQT.SHIP.PTR in 1 hour 28 29 Else ''tug is unavailable so wait in the tug's queue 30 31 File .RQT.SHIP.PTR in the QUE.TUG(1) 32 33 Endif ''N.EXE.TUG(1) < NUMBER.OF.TUGS(1) 34 35 End ''REQUEST.TUG —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-31

  32. Release the Tug 1 Event RELEASE.TUG 2 given .RLT.SHIP.PTR 3 4 Define .RLT.SHIP.PTR and .QUEUED.SHIP.PTR as pointer variables 5 6 ''Release the tug and let tug take the first queued 7 ''ship to its destination. Note that tug position ignored(!) 8 Remove .RLT.SHIP.PTR from the EXE.TUG(1) 9 If the QUE.TUG(1) is not empty 10 11 Remove the first .QUEUED.SHIP.PTR from the QUE.TUG(1) 12 File .QUEUED.SHIP.PTR in the EXE.TUG(1) 13 14 Select case SHIP.STATUS(.QUEUED.SHIP.PTR) 15 Case ..AT.HARBOR 16 Let SHIP.STATUS(.QUEUED.SHIP.PTR) = ..TO.DOCK 17 Case ..AT.DOCK 18 Let SHIP.STATUS(.QUEUED.SHIP.PTR) = ..TO.SEA 19 Default 20 Print 1 line with time.v and 21 SHIP.STATUS(.QUEUED.SHIP.PTR) thus *******.*** ERROR in RELEASE.TUG: Invalid next ship status *** 23 Stop 24 Endselect ''SHIP.STATUS(.QUEUED.SHIP.PTR) 25 26 ''Send the queued ship on its way 27 Schedule a RELEASE.TUG giving .QUEUED.SHIP.PTR in 1 hour 28 29 Endif 30 31 ''If the ship has just arrived at the dock, start unloading. 32 ''Schedule the end of the unloading activity - when tug needed again. 33 ''If ship heading out from dock, schedule an immediate release of 34 ''the dock. Note that dock could be release earlier(!) —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-32

  33. Release the Tug (continued) 35 Select case SHIP.STATUS(.RLT.SHIP.PTR) 36 Case ..TO.DOCK 37 Let SHIP.STATUS(.RLT.SHIP.PTR) = ..AT.DOCK 38 Schedule a REQUEST.TUG giving .RLT.SHIP.PTR 39 in SHIP.UNLOAD.TIME(.RLT.SHIP.PTR) hours 40 Case ..TO.SEA 41 Let SHIP.STATUS(.RLT.SHIP.PTR) = ..AT.SEA 42 Schedule a RELEASE.DOCK giving .RLT.SHIP.PTR now 43 Default 44 Print 1 line with time.v and SHIP.STATUS(.RLT.SHIP.PTR) thus *******.*** ERROR in RELEASE.TUG: Invalid current ship status *** 46 Stop 47 Endselect ''SHIP.STATUS(.RLT.SHIP.PTR) 48 49 End ''RELEASE.TUG —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-33

  34. Release the Dock 1 Event RELEASE.DOCK 2 Given .RD.SHIP.PTR 3 4 Define .RD.SHIP.PTR and .QUEUED.SHIP.PTR as pointer variable 5 Define .WAITING.TIME as a real variable 6 7 ''Collect waiting time statistics and count number of ships served 8 Add 1 to NO.OF.SHIPS.SERVED 9 Let .WAITING.TIME = 10 (time.v - SHIP.ARRIVAL.TIME(.RD.SHIP.PTR)) * hours.v - 11 SHIP.UNLOAD.TIME(.RD.SHIP.PTR) 12 Add .WAITING.TIME to TOTAL.WAITING.TIME 13 Let MAX.WAITING.TIME = max.f(MAX.WAITING.TIME,.WAITING.TIME) 14 15 ''Release the dock and free up computer memory 16 Remove .RD.SHIP.PTR from the EXE.DOCK(1) 17 Destroy the SHIP called .RD.SHIP.PTR 18 19 ''Check the dock queue for ships 20 If the QUE.DOCK(1) is not empty 21 22 Remove the first .QUEUED.SHIP.PTR from the QUE.DOCK(1) 23 File .QUEUED.SHIP.PTR in the EXE.DOCK(1) 24 Let SHIP.STATUS(.QUEUED.SHIP.PTR) = ..AT.HARBOR 25 Schedule a REQUEST.TUG giving .QUEUED.SHIP.PTR now 26 27 Endif 28 29 End ''RELEASE.DOCK —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-34

  35. Final Report 1 Event FINAL.REPORT 2 3 Skip 2 output lines 4 5 Print 4 lines with RUN.LENGTH thus Pacific Port Problem (Answer to Student Problem 1) Run length is **** days. 10 Skip 2 output lines 11 12 Print 4 lines with time.v, 13 NO.OF.SHIPS.SERVED, 14 TOTAL.WAITING.TIME/NO.OF.SHIPS.SERVED and 15 MAX.WAITING.TIME thus After ***.** days, *** ships have been unloaded. The average waiting time was **.** hours. The maximum waiting time was **.** hours. 20 21 Skip 2 lines 22 23 Read as / using unit 5 24 25 Stop 26 27 End ''FINAL.REPORT —————————— CACI Products Company ——————————————————————————————— SimScript II.5 —————————————— 5-35

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